The Facebook Business Manager ID corresponds to your Business Manager, the central platform where you can manage your ads, manage assets such as Pages and add accounts, and even add an agency or partners to help manage your business; in this case, the WhatsApp Business Profile.It is a 16-digit number that uniquely id
Your business ID corresponds to your Meta Business Manager. Steps to find your business ID can be found below:
2. Go to Business Settings.
3. Go to Business Info Section. Once you open this section, you will be able to find Facebook Business Manager ID